}
//获取相应数据模型
SchoolClass * obj = [_fecCon objectAtIndexPath:indexPath];
cell.textLabel.text = obj.name;
cell.detailTextLabel.text = [NSString stringWithFormat:@"有%@人",obj.stuNum];
return cell;
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return [_fecCon sections].count;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
id<NSFetchedResultsSectionInfo> info = [_fecCon sections][section];
return [info numberOfObjects];
}
效果如下：
四、将数据变化映射到视图
//数据将要改变时调用的方法
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
//开启tableView更新预处理
[[self tableView] beginUpdates];
}
//分区数据改变时调用的方法
- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
{
//判断行为类型
switch(type) {
//插入新分区
case NSFetchedResultsChangeInsert:
[[self tableView] insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
//删除分区
case NSFetchedResultsChangeDelete:
[[self tableView] deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
//移动分区
case NSFetchedResultsChangeMove:
//更新分区
case NSFetchedResultsChangeUpdate:
break;
}
}
//数据改变时回调的代理
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath
